<div class="refentry" lang="en" xml:lang="en"><a id="glCopyTexSubImage1D"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glCopyTexSubImage1D — copy a one-dimensional texture subimage</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table><tr><td><code class="funcdef">void <b class="fsfunc">glCopyTexSubImage1D</b>(</code></td><td>GLenum  </td><td><var class="pdparam">target</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">level</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">xoffset</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">x</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">y</var>, </td></tr><tr><td> </td><td>GLsizei  </td><td><var class="pdparam">width</var><code>)</code>;</td></tr></table></div></div><p>
    </p><div class="refsect1" lang="en" xml:lang="en"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>target</code></em></span></dt><dd><p>
                    Specifies the target texture.
                    Must be <code class="constant">GL_TEXTURE_1D</code>.
                </p></dd><dt><span class="term"><em class="parameter"><code>level</code></em></span></dt><dd><p>
                    Specifies the level-of-detail number.
                    Level 0 is the base image level.
                    Level <span class="emphasis"><em>n</em></span> is the <span class="emphasis"><em>n</em></span>th mipmap reduction image.
                </p></dd><dt><span class="term"><em class="parameter"><code>xoffset</code></em></span></dt><dd><p>
                    Specifies the texel offset within the texture array.
                </p></dd><dt><span class="term"><em class="parameter"><code>x</code></em>, </span><span class="term"><em class="parameter"><code>y</code></em></span></dt><dd><p>
                    Specify the window coordinates of the left corner
                    of the row of pixels to be copied.
                </p></dd><dt><span class="term"><em class="parameter"><code>width</code></em></span></dt><dd><p>
                    Specifies the width of the texture subimage.
                </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
            <code class="function">glCopyTexSubImage1D</code> replaces a portion of a one-dimensional
            texture image with pixels from the current <code class="constant">GL_READ_BUFFER</code> (rather
            than from main memory, as is the case for <a class="citerefentry" href="glTexSubImage1D"><span class="citerefentry"><span class="refentrytitle">glTexSubImage1D</span></span></a>).
        </p><p>
            The screen-aligned pixel row with left corner at (<em class="parameter"><code>x</code></em>,\ <em class="parameter"><code>y</code></em>), and with
            length <em class="parameter"><code>width</code></em> replaces the portion of the
            texture array with x indices <em class="parameter"><code>xoffset</code></em> through
            <math overflow="scroll">

                <mrow>
                    <mi mathvariant="italic">xoffset</mi>
                    <mo>+</mo>
                    <mi mathvariant="italic">width</mi>
                    <mo>-</mo>
                    <mn>1</mn>
                </mrow>
            </math>,
            inclusive. The destination in the texture array may not
            include any texels outside the texture array as it was
            originally specified.
        </p><p>
            The pixels in the row are processed exactly as if
            <a class="citerefentry" href="glCopyPixels"><span class="citerefentry"><span class="refentrytitle">glCopyPixels</span></span></a> had been called, but the process stops just before
            final conversion.
            At this point, all pixel component values are clamped to the range
            <math overflow="scroll">

                <mfenced open="[" close="]">
                    <mn>0</mn>
                    <mn>1</mn>
                </mfenced>
            </math>
            and then converted to the texture's internal format for storage in the texel
            array.
        </p><p>
            It is not an error to specify a subtexture with zero width, but
            such a specification has no effect.
            If any of the pixels within the specified row of the current
            <code class="constant">GL_READ_BUFFER</code> are outside the read window associated with the current
            rendering context, then the values obtained for those pixels are undefined.
        </p><p>
            No change is made to the <span class="emphasis"><em>internalformat</em></span>, <span class="emphasis"><em>width</em></span>,
            or <span class="emphasis"><em>border</em></span> parameters of the specified texture
            array or to texel values outside the specified subregion.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>
            <code class="function">glCopyTexSubImage1D</code> is available only if the GL version is 1.1 or greater.
        </p><p>
            Texturing has no effect in color index mode.
        </p><p>
            <a class="citerefentry" href="glPixelStore"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a> and <a class="citerefentry" href="glPixelTransfer"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a> modes affect texture images
            in exactly the way they affect <a class="citerefentry" href="glDrawPixels"><span class="citerefentry"><span class="refentrytitle">glDrawPixels</span></span></a>.
        </p><p>
            When the <code class="code">ARB_imaging</code> extension is supported, the RGBA components
            copied from the framebuffer may be processed by the imaging pipeline.  See
            <a class="citerefentry" href="glTexImage1D"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a> for specific details.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>
            <code class="constant">GL_INVALID_ENUM</code> is generated if /<em class="parameter"><code>target</code></em> is not <code class="constant">GL_TEXTURE_1D</code>.
        </p><p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if the texture array has not
            been defined by a previous <a class="citerefentry" href="glTexImage1D"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a> or <a class="citerefentry" href="glCopyTexImage1D"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage1D</span></span></a> operation.
        </p><p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>level</code></em> is less than 0.
        </p><p>
            <code class="constant">GL_INVALID_VALUE</code> may be generated if
            <math overflow="scroll">

                <mrow>
                    <mi mathvariant="italic">level</mi>
                    <mo>&gt;</mo>
                    <mrow>
                        <msub><mi mathvariant="italic">log</mi>
                        <mn>2</mn>
                        </msub>
                        <mo>⁡</mo>
                        <mfenced open="(" close=")">
                            <mi mathvariant="italic">max</mi>
                        </mfenced>
                    </mrow>
                </mrow>
            </math>,
            where <span class="emphasis"><em>max</em></span> is the returned value of <code class="constant">GL_MAX_TEXTURE_SIZE</code>.
        </p><p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if
            <math overflow="scroll">

                <mrow>
                    <mi mathvariant="italic">xoffset</mi>
                    <mo>&lt;</mo>
                    <mrow>
                        <mo>-</mo>
                        <mi mathvariant="italic">b</mi>
                    </mrow>
                </mrow>
            </math>,
            or
            <math overflow="scroll">

                <mrow>
                    <mfenced open="(" close=")">
                        <mrow>
                            <mi mathvariant="italic">xoffset</mi>
                            <mo>+</mo>
                            <mi mathvariant="italic">width</mi>
                        </mrow>
                    </mfenced>
                    <mo>&gt;</mo>
                    <mfenced open="(" close=")">
                        <mrow>
                            <mi mathvariant="italic">w</mi>
                            <mo>-</mo>
                            <mi mathvariant="italic">b</mi>
                        </mrow>
                    </mfenced>
                </mrow>
            </math>,
            where
            <math overflow="scroll"><mi mathvariant="italic">w</mi></math>
            is the <code class="constant">GL_TEXTURE_WIDTH</code> and
            <math overflow="scroll"><mi mathvariant="italic">b</mi></math>
            is the <code class="constant">GL_TEXTURE_BORDER</code>
            of the texture image being modified.
            Note that
            <math overflow="scroll"><mi mathvariant="italic">w</mi></math>
            includes twice the border width.
        </p><p>
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
            <a class="citerefentry" href="glGetTexImage"><span class="citerefentry"><span class="refentrytitle">glGetTexImage</span></span></a>
        </p><p>
            <a class="citerefentry" href="glIsEnabled"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_TEXTURE_1D</code>
        </p></div>
        {$pipelinestall}{$examples}
        <div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
            <a class="citerefentry" href="glCopyPixels"><span class="citerefentry"><span class="refentrytitle">glCopyPixels</span></span></a>,
            <a class="citerefentry" href="glCopyTexImage1D"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage1D</span></span></a>,
            <a class="citerefentry" href="glCopyTexImage2D"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage2D</span></span></a>,
            <a class="citerefentry" href="glCopyTexSubImage2D"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage2D</span></span></a>,
            <a class="citerefentry" href="glCopyTexSubImage3D"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage3D</span></span></a>,
            <a class="citerefentry" href="glPixelStore"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a>,
            <a class="citerefentry" href="glPixelTransfer"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>,
            <a class="citerefentry" href="glReadBuffer"><span class="citerefentry"><span class="refentrytitle">glReadBuffer</span></span></a>,
            <a class="citerefentry" href="glTexEnv"><span class="citerefentry"><span class="refentrytitle">glTexEnv</span></span></a>,
            <a class="citerefentry" href="glTexGen"><span class="citerefentry"><span class="refentrytitle">glTexGen</span></span></a>,
            <a class="citerefentry" href="glTexImage1D"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a>,
            <a class="citerefentry" href="glTexImage2D"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>,
            <a class="citerefentry" href="glTexImage3D"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a>,
            <a class="citerefentry" href="glTexParameter"><span class="citerefentry"><span class="refentrytitle">glTexParameter</span></span></a>,
            <a class="citerefentry" href="glTexSubImage1D"><span class="citerefentry"><span class="refentrytitle">glTexSubImage1D</span></span></a>,
            <a class="citerefentry" href="glTexSubImage2D"><span class="citerefentry"><span class="refentrytitle">glTexSubImage2D</span></span></a>,
            <a class="citerefentry" href="glTexSubImage3D"><span class="citerefentry"><span class="refentrytitle">glTexSubImage3D</span></span></a>
        </p></div><div class="refsect1" lang="en" xml:lang="en"><div id="Copyright"><h2>Copyright</h2><p>
            Copyright © 1991-2006
            Silicon Graphics, Inc. This document is licensed under the SGI
            Free Software B License. For details, see
            <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
        </p></div></div></div>
